19425040000 has 80 divisors (see below), whose sum is σ = 48357622170. Its totient is φ = 7769984000.

The previous prime is 19425039973. The next prime is 19425040001. The reversal of 19425040000 is 4052491.

It can be written as a sum of positive squares in 5 ways, for example, as 848440384 + 18576599616 = 29128^2 + 136296^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (19425040001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 41407 + ... + 201406.

Almost surely, 2^19425040000 is an apocalyptic number.

19425040000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19425040000 is an abundant number, since it is smaller than the sum of its proper divisors (28932582170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19425040000 is an frugal number, since it uses more digits than its factorization.

19425040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242847 (or 242820 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 19425040000 its reverse (4052491), we get a palindrome (19429092491).

The spelling of 19425040000 in words is "nineteen billion, four hundred twenty-five million, forty thousand".